# iKF vs Z2Y Java Principles

The clearest difference is price: iKF at Free against Z2Y Java Principles's $1.99. Z2Y Java Principles's advantage is update cadence (every 5 days vs every 3 weeks) and device support (4 vs 2). On ads, in-app purchases and iOS requirement there is nothing between them.

iKF is free to download; Z2Y Java Principles costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iKF ships an update every 3 weeks, Z2Y Java Principles every 5 days. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | iKF | Z2Y Java Principles |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.2 (85 ratings)](https://appshunter.io/ios/app/ikf/id1629620859/reviews)** | — |
| Number of ratings | **85** | — |
| Positive reviews | 75.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free | — |
| Size | 242 MB | 257 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Dongguan Awu Technology Co., Ltd.](https://appshunter.io/developer/1616506708) | [洁 欧阳](https://appshunter.io/developer/1715570257) |

## What reviewers say

### iKF

[App page](https://appshunter.io/ios/app/ikf/id1629620859)

Tailor your audio experience with personalized settings and unique functionalities. This app allows for custom sound profiles, noise cancellation adjustments, and control over device interactions. It also provides essential management features like battery checks and firmware updates.

**Highlights:** Burn-in Function, Noise Cancellation modes, Customise gesture controls, Customise equaliser settings, Set a private alarm, Check battery levels, Update firmware

**Features:** macOS Compatibility

**In-app purchases:** none


### Z2Y Java Principles

[App page](https://appshunter.io/ios/app/z2y-java-principles/id6504158005)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iKF free?

iKF is free to download, with no in-app purchases.

### Is Z2Y Java Principles free?

Z2Y Java Principles costs $1.99, with no in-app purchases.

### Do iKF or Z2Y Java Principles have ads?

Neither iKF nor Z2Y Java Principles shows ads.

### Which is updated more often, iKF or Z2Y Java Principles?

iKF ships an update every 3 weeks, and Z2Y Java Principles every 5 days. Most recently, iKF was updated on September 10, 2026 and Z2Y Java Principles on September 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*